package com.test.lambda.demo4;

public class Java8Tester {
    public static void main(String[] args) {
        Java8Tester tester = new Java8Tester();

        //类型声明
        MathOperation addition = (int a, int b) -> a + b;

        //不声明类型
        MathOperation subtraction = (a, b) -> a - b;

        /// 大括号中的返回语句
        MathOperation multiplication = (int a, int b) -> {return a * b;};

        //没有大括号返回语句
        MathOperation division = (int a, int b) -> a / b;

        System.out.println("10 + 5=" + tester.operate(10, 5, addition));
        System.out.println("10 + 5=" + tester.operate(10, 5, (int a, int b) -> a+b));
        System.out.println("10 - 5=" + tester.operate(10, 5, subtraction));
        System.out.println("10 x 5=" + tester.operate(10, 5, multiplication));
        System.out.println("10 / 5=" + tester.operate(10, 5, division));


        GreetingService greetingService1 = message ->
                System.out.println("hello " + message);

        GreetingService greetingService2 = (message) ->
                System.out.println("hello " + message);

        greetingService1.sayMessage("Runoob");
        greetingService2.sayMessage("Google");
    }


    interface MathOperation {
        int operation(int a, int b);
    }

    interface GreetingService {
        void sayMessage(String msg);
    }

    public int operate(int a, int b, MathOperation mathOperation){
        return  mathOperation.operation(a,b);
    }
}